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【单选题】
KZS／M-I型轴报器中调制解调器的第ll脚是（）
A.
串行数据接收端
B.
串行数据发送端
C.
振荡器输出端
D.
电源接地端
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【单选题】Online services are managed by a host system that maintains a base of information available to satellite users. Users of so-called "dumb" terminals (i. e., those without processing capability)simply a...
A.
Online services are managed by a host system that maintains a base of information available to satellite users. Users of so-called "dumb" terminals (i. e., those without processing capability)simply access the information base via programs stored on the system. Personal computer (PC) users typically access the host through a modem (调制解调器). A PC software program serves as an intece (接口)between the server and a PC, allowing the user to operate through the online system and select different databases using a keyboard or a mouse.
B.
National and regional online systems usually have local telephone numbers that PC modems can call to access either a local information base or an indirect long-distance connection, thus reducing long-distance telephone fees. Some online systems allow users ’to copy large volumes of information onto a local memory storage device, which also reduces the time the user is connected to the online system.
C.
Besides offering a great number of different information based, ranging from full-text journal li- braries to reports of missing children, online services allow users to, for example, reserve airline tick- ets, buy stocks, purchase goods, and communicate with other users. In exchange for the service, users usually pay a monthly membership fee. They may also pay to connect to various databases on the service or to download information.
【单选题】ITU V90调制解调器(MODEM)______。
A.
下载速率是56kb/s，上传速率是33.6kb/s
B.
上下行速率都是56kb/s
C.
与标准X.25公用数据网连接，以56kb/s的速率交换数据
D.
时刻与ISP连接，只要开机，永远在线
【单选题】调制解调器(Modern)的作用是( )。
A.
将数字脉冲信号转换成模拟信号
B.
将模拟信号转换成数字脉冲信号
C.
将数字脉冲信号与模拟信号互相转换
D.
为了上网与打电话两不误
【多选题】在Excel2003中，调整单元格的列宽可以通过( )完成。
A.
双击列标右边的边界，使列宽适合单元格的内容
B.
拖动列标左边界来设置所需的列宽
C.
选定相应的列，将鼠标指向“格式”菜单中的“列”子菜单，然后选择“列宽”命令并输入所需的宽度
D.
复制列宽
E.
拖动列标右边界来设置所需的列宽
【单选题】养身实践中“调神”可从哪项入手（）
A.
四气调神，药物养神，节欲养神，修性怡神，气功练神
B.
四气调神，气功练神，饮食养神，修性怡神，节欲养神
C.
和情畅志，四气调神，气功练神，修性怡神，节欲养神
D.
和情畅志，清静养神，气功练神，修性怡神，节欲养神
E.
和情畅志，形神共养，气功练神，修性怡神，节欲养神
【单选题】调制解调器(Modem)的功能是。
A.
将数字信号转换成模拟信号
B.
将模拟信号转换成数字信号
C.
兼有A和B的功能
D.
使用不同频率的载波将信号变换到不同的频率范围
【单选题】CRT电子枪中，调制极的特点是（）
A.
调制极电位低于阴极电位且是可调的负电位
B.
调制极电位是可调的正电位，永远比阴极电位高
C.
调制极电位是比阴极电位高的常值
D.
调制极电位是比阴极电位低的常值
相关题目：
【单选题】Online services are managed by a host system that maintains a base of information available to satellite users. Users of so-called "dumb" terminals (i. e., those without processing capability)simply a...
A.
Online services are managed by a host system that maintains a base of information available to satellite users. Users of so-called "dumb" terminals (i. e., those without processing capability)simply access the information base via programs stored on the system. Personal computer (PC) users typically access the host through a modem (调制解调器). A PC software program serves as an intece (接口)between the server and a PC, allowing the user to operate through the online system and select different databases using a keyboard or a mouse.
B.
National and regional online systems usually have local telephone numbers that PC modems can call to access either a local information base or an indirect long-distance connection, thus reducing long-distance telephone fees. Some online systems allow users ’to copy large volumes of information onto a local memory storage device, which also reduces the time the user is connected to the online system.
C.
Besides offering a great number of different information based, ranging from full-text journal li- braries to reports of missing children, online services allow users to, for example, reserve airline tick- ets, buy stocks, purchase goods, and communicate with other users. In exchange for the service, users usually pay a monthly membership fee. They may also pay to connect to various databases on the service or to download information.
【单选题】ITU V90调制解调器(MODEM)______。
A.
下载速率是56kb/s，上传速率是33.6kb/s
B.
上下行速率都是56kb/s
C.
与标准X.25公用数据网连接，以56kb/s的速率交换数据
D.
时刻与ISP连接，只要开机，永远在线
【单选题】调制解调器(Modern)的作用是( )。
A.
将数字脉冲信号转换成模拟信号
B.
将模拟信号转换成数字脉冲信号
C.
将数字脉冲信号与模拟信号互相转换
D.
为了上网与打电话两不误
【多选题】在Excel2003中，调整单元格的列宽可以通过( )完成。
A.
双击列标右边的边界，使列宽适合单元格的内容
B.
拖动列标左边界来设置所需的列宽
C.
选定相应的列，将鼠标指向“格式”菜单中的“列”子菜单，然后选择“列宽”命令并输入所需的宽度
D.
复制列宽
E.
拖动列标右边界来设置所需的列宽
【单选题】养身实践中“调神”可从哪项入手（）
A.
四气调神，药物养神，节欲养神，修性怡神，气功练神
B.
四气调神，气功练神，饮食养神，修性怡神，节欲养神
C.
和情畅志，四气调神，气功练神，修性怡神，节欲养神
D.
和情畅志，清静养神，气功练神，修性怡神，节欲养神
E.
和情畅志，形神共养，气功练神，修性怡神，节欲养神
【单选题】调制解调器(Modem)的功能是。
A.
将数字信号转换成模拟信号
B.
将模拟信号转换成数字信号
C.
兼有A和B的功能
D.
使用不同频率的载波将信号变换到不同的频率范围
【单选题】CRT电子枪中，调制极的特点是（）
A.
调制极电位低于阴极电位且是可调的负电位
B.
调制极电位是可调的正电位，永远比阴极电位高
C.
调制极电位是比阴极电位高的常值
D.
调制极电位是比阴极电位低的常值
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